Speed control switch for cash registers



Aug. 18, 1931. M. M. GOLDBERG 1,319,083

shin CONTROL sin-on ron CASH asszsxsas Filed Nov. 23, 1925 2 sums-snow 1 Aug. 18, 1931. M. M. GOLDBERG 1.8193083 SPEED CONTROL SWITCH FOR CASH REGISTERS Filed Nov. 23, 1925 2 Sheets-Sheet 2 H62 Fla-a I BI r|||l|1""" Ill IIIIIIIIII'lIIIIIIIIIIIIIIIIIIIllllll'l His 6%.?

Patented Aug. 18, 1931 UNITED STA- res PATENT OFFICE" maxnnman m. commune, or DAYTON, omo, assrenon, BY um Assrommm'rs, 'ro THE NATIONAL cam REGISTER comramr, or DAYTON, care, A conaeomnox OF MARYLAND SPEED CONTROL SWITCH FOB CASH REGISTERS Application filed November 23, 1925. Serial No. 70,984.

- tures of construction and combinations of parts, the essential elements of which are set forth in appended claims and a preferred form or embodiment of which is [hereinafter described with reference to the drawings which accompany and form part of this specification.

Of said figures:

Fig. 1 is a view of the speed control mechanism, and the mechanism of a cash register with which it cooperates.

Fig. 2 is. a detail view in side elevation of part of the speed control mechanism.

Fig. 3 is a detail view, partly inisection,

showing the mechanism for opening the control switches.

Fi 4 is a detail view of part .of the mechanism shown in Fig. 3. Q

Fig. 5 is a detail view of the starting switch.

Fig.6 is a diagram of the control' circuit.

I Fig. 7 is a detail view of a part of the motor stopping mechanism shown in Fig. 1. In general In power driven cash registers, particularly those which are driven by means of an electric motor, the accumulated speed of the machine on a series of rapidly successive operations may be so great as to damago some of the parts of the machine. This GKCQSSl"O speed is due to the fact that the armature will not come to rest, if the machine is released and a current applied to the motor immediately after the completion .of the previous operation. In order to overcome thls, a mechanism has been rovided which automatically opens a switc in the circuit through the motor, after the machine has reached home, andholds it'open for a predetermined length of time thereafter, Sullicient to permit the armature of the motor to either stop or slow down to such an extent that its momentum will be greatly reduced.

This device is herein shown attached to a machine of the ty e shown in the copending application of I ernis M. Shipley, Serial No.'687,305, filed J anuairy 19 1924. This device is particularly important in a machine of this type, it being an itemized receipt printing. machine in which operations are performed in rapid succession. However, it is apparent that the, device can be used. with any other type of machine of this class,

not being limited foruse in connection with itemized receipt printing machines.

In detmZ Driving meclwn-ism.-Suitably mounted in the frame work of the machine is a cam shaft 30 (Fig. 1), towhich is secured a gear 31 meshing-with a gear 32 secured to a gear 33 mounted on a stud 29 carried by the frame work of the machine. The gear 33 meshes with a pinion 34 which forms a part of a clutch mechanism of the ty shownanddescribed in the Letters Patent of the United States issued to C. F. Kettering and'W. A. Chryst, No. 1,144,418, June 29,, 1915. No detailed description of the ciutch mechanism is herein given as reference may behad to this patent. The clutch connects the pinion 34 to a gear meshing with a bevelled pinion 35 secured to a gear 36 meshing with a pinion 37 secured to the armature 38 of the motor.

The motoris started by closing a. switch in a circuit through the motor shown in F i 6. This switch comprises a resilient bla e and a contact plate 46 (Figs. 5 and 6) suitably mounted on a bracket 44.. Coopcrating with the switch blade 45 is an arm 47 which is connected to an arm 48 by a crossbar 49. The arms 47 and 48 ,are'pivoted on a shaft 50 suitably mounted in the frame work of the machine. The arm 48 is mentioned clutch mechanism. The disk 52 normally tends to rotate in a clockwise direction due to a spring 53, one end of which is connected to a stud 54 mounted on the 10d disk 52 and the other end of which is connected to a stud carried by the other member of he clutch mechanism. Mounted on the di k 52 is a block 50 which is held in contact with an arm of a lever 57 (see also Fig. 1) when the machine is home. When the machine is released by means to be here inafter described, the lever 57 is rocked on the shaft 58 by a spring 59 to remove it from the path of the block 50 and thereby permit the spring to rotate the disk which by means of a cam edge thereon, will rock the arms 17 and clockwise and press the blade against the contact plate 46. This will close the circuit (Fig. 6) through the driving motor, and, by means of the pinion 37 (Fig. 1), gear 36 and the clutch mechanism, will rotate the pinion 34: in a clockwise direction, which movement will be transmitted to the gear 31 on driving cam shaft by means of the interme diate gears 32 and 33. In this manner, the drive shaft 30 is given one complete rotation at each operation of the machine, the end of which rotation, a stud Gil 7), mounted on a disk 61 fast with the cam shaft 30 wipes along the surface 62 on the right hand end of the lever 57 and rocks the left hand end thereof into the path of the block 56, thereby permitting the switch blade to spring away from its contact blade 16 to open the circuit, and in so doing, rock the arms 17, -18 to their normal positions shown in Fig. 5.

Releasing 1n607i(uzism.-lilounted on the lever 57 1) is a stud 66 which contacts the upper end of one arm (37 of a bell crank when the machine is in its home position. Tl bell crank is journaled on the shaft 30 4.110 and has a rearwardly projecting arm 68 to which is pivoted the lower end of a link 69. The upper end of the link 69 is pivoted to an arm 70 secured to a shaft 71. Also secured to the shaft 71 is an arm 72 which has mounted thereon a flattened stud 7 3 held in contact with a trip pawl 71; by a spring (not shown) which n rmally tends to rotate the shaft 71 in a clockwise direction. Pivoted to the pawl 7 *1 is a link 7 5 which is also pivoted to an arm 76. The arm 76 is bifurcated to engage a stud 77 mounted on a sliding plate 78. The plate 78 is provided with slots 79 by means of which the plate is mounted on studs 80 carried by one of the frames of the machine. Also mounted on the plate 78 are stuns 81 upon which a motor bar 82 is detachably mounted.

The machine is released by depressing the motor bar 82, thereby sliding the plate 78 inwardly. This movement of the plate 78 will rock the arm 76, which, by means of the link 75, will swing the pawl 74: away from the stud 73, thereby permitting the above mentioned spring (not shown) to rock the shaft 71 and arm 72 in a clockwise direction.

Clockwise movement of the shaft 71 will lower the link 69 to shift the arm (37 from beneath the stud G6, which will permit the spring 59 to rotate the lever 57 to disengage it from the block 56, as above described.

"he above releasing mechanism is fully shown and described in the above mentioned Shipley application, and therefore, no further reference thereto is thought necessary herein.

Speed control meek-aniam-.As above mentioned, on repeat operations, it the oncuitthrough the motor is again closed before the momentum of the armature due to the previous operation has spent itself, the speed of the next succeeding operation may he QFlOfSSix'Q and in any event, rapidly sue cessive operations of the machine will result in gradually accelerating the speed of rotation of the armature to the detriment of the machine. Such gradual building up of momentum occurs more particularly in the armatures of series wound motors. In order to prevent a second operation of the machine before the armature has either ceased its rotation, or the momentum thereof has nearly spent itself, another switch has been provided in the motor circuit, together with a means cooperating therewith, to hold the switch open long enough to permit the arma' ture of the motor to either come to rest, or to permit the momentum thereof to become nearly exhausted.

lwleshing with the gear 31 on the driving cam shaft 30 is a pinion 90 loosely mounted on a stud 91 carrier by the frame work of the machine. hfeshing with the pinion 90 is a gear 92 mounted on a stud 93. The gear 92 meshes with a gear 94 mounted on a stud 95. The studs 93 and 95 are carried on aplate 89 (Figs. 1 and carried by the frame work of the machine. This plate is she vn by dot and dash lines in Fig. 1 because it is in front of the mechanism shown therein. Mounted in the gear 94 is a stud 90 (Figs. 1 and 4) to which is attached one end of a clock spring 97, the other end of which is connected to a stud 98 mounted on a cam plate 99 secured to a gear 100 journaied on stud 95 beside the gear 94. The cam plate 99 is provided with a laterally projecting shoulder 101 (Fig. 2) which is held in contact with a lateral lug 102 on a disk secured to the gear 94, by the spring 97 when the machine is in its home position.

Pivoted on a stud 103 (Figs. 1 and 3) is a pawl 10-1 having an arm 105 which is held in engagement with a stud 100 carried by the gear 92 by means of a spring 107 when the machine is in its home position. The nose 108 of the pawl 10% is adapted to be moved into the path of the shoulder 101 on the cam plate 99 immediately after the machine starts to operate.

urgent 100. Since the gear 94 Rotation of the gear 31.by-the;motor,;as: above described, rotatesthe gear 92 in a clockwise direction by means of thepi-nion 90. When thegear 92 begins to rotate, the

stud 106 thereon will be from thearm105of the, pawl 104,1. erehy permitting the spring 107 to rock the nose 109 into the path.- of' the shoulder 101. Rotation of. the gear 92 rotates the gear 94 in counterclockwise direction to wind up the flexible drivespring 97, and cam plate 99 and the gear 100 secured thereto, will be carried with the gear 94 by means. of the clock spring 97 which holdsthe shoulder 101.,in contact with the; shoulder 102. Shortly after the machine starts to o crate, the shoulder 101 will contact and he by the nose 108 of the pawl 104, which prevents further rotatiom of the cam-{99st}? t 0 lug 102is-driven by the gear 92, it w continue, to rotate and in this manner it will wind up the spring 97. Substantially, at the end of the operation ofthe machine, the "stud 106 on the gear 92 will again engage the arm 105 ofthe pawl 104, and will rock the arm 108 thereof away from the shoulder 101, thereby releasing the camplate 99, permitting. it to rotate under theinfluence of; the spring 97 until it catchmup with and contacts the lug 102 of thegear Mwhich arrests further rotation of the gear 100 and. the train connected therewith.

One arm of a. bell crank switch 1155 (Fig. 371) journaled on a stud'115; projectingffrom the frame plate 89 carries a contact 117 insulated therefrom and. adapted to engage between two contact lips 118 mounted on a bar of insulating material. fastened tothe frame @mlate89 The contact 117. and. contact lips 118 form part ofthe-motor circuit, as shown in Fig. 6. a

A roller 120 mounted on the remaining arm of the-bell crank switch 116is yieldingly held by a spring 121 against thecam diak99.

When the parts are in their normal or home positions, the roller 120 lies in a low portion or recess 122. of the cam: disk 99, with the contact 117 emhracedhetwecn the 'Icontact lips 118tov complete the circuit at this point.

As the machine starts an operation, and the gear 94' rotates to wind up the flexible driving connection or spring 97, the spring turns the cam disk 99 and gear 100' as heretofore explained, the low portion or recess 122 being of sufiicient extent to permit the switch 116 to remain in its normal position while the cam disk isbeing rotated through the directdrive from the gear 92and during thetime when the cam disk and itsgear 100. are held againstrotation by the locking pawl 104..

But, as soon as the locking pawl 104 is tripped, and the cam disk 99 and geararrested am; freed to the action of the wound: clock spring97, the disk 99 turns to brin an unmutilatedportion ofits periphery. heath the. roller and rocks the switch 116.: to open the motor circuit between. thecontactsiw 117, 118.

It will be remembered that. the cam is notfreleasedi until nearly the end: oi. the operation of the machine. The rotation of, the cam 99 under the influence of: the wound spring 97 takes. place after the machine hascome to rest at theend of; an operation, and therefore, the circuit through the drive ing motor will. be automatically held open for such length of time after the machine comesto rest in its home Eositiomasit takes the spring 97 to turn t a cam d'wk. 99-to bring the low portion 122 0! can he? neath the roll 120 of the switch 116.. From' this itcan be seen thatif, atithisitime the operator should: depress the motor bar82; trip the clutch and effect ment of the switch blade 45 with the contact et the circuit will not Y yet. be completed asmhe. switch contacm 117 and 118 areeheld. dis? engaged by the unmutilated. peri hery of the cam (118k. 99. This circuit wi 1 remain. open until the cam 99 reaches: its: home position and the roller 120 of the switch: 116 is again rocked; into tbedcpressed pair: tion 122 ,whereupon the contacts 117 and. 118. are again r aged.

To prev i it the ring 97- fromxunwinding too rapidly, and tliereb "defeating the object of this invention which is to: dela the closing of the automatic switch 116'unt1l the: motor armature has had time to. come to rest, a governor is. aided to retardtthaz speed of rotation o thev gear 100. Meshing with thexgear 100 is a pinion 123 secured, to a gear 124'. The gear 124: is mounted on a stud 125 carried by the plate 89,. and meshes with a pinion 126 secured to ally governor 127. The governor 127 is rotatably mounted on a stud 128-also mounted on the plate 89, and comprises aplurality of vanes 129, each of which is: provided with a resistance blade 130:

From the abore'description it is a aremt: that whenithe cam disk-99. isrele m to be. operated by the spring97,the governor 127 will berotated by the pinions 123 and126 and the gear 124, and, as above stated, the blades 130 will provide enough resistance to this train (if-mechanism to preventxthe spring 97 from being-unwound too ra idly.

Briefly, assuming the machine to he at rest, as in Fig. 1, with the motor circuit closed at the contacts 117, 118,. and open; at thecontactsdb, 46, (Figs. 5 and6e),.tiia motor idle, and the clutch held disengaged by the detent lever 57, the operator, after setting up on the keyboard the amount to be registered, depresses the'startingi key 82..

As eretofiomexplained, depression ofthe starting key trips the do 74 freeing bell crank 67 to the action or its spring (not shown) which rocks the bell crank 67 to release the detent lever 57, whereupon spring 59 rocks the detent lever from the path of the abutment 56 on the cam disk 52 secured to one member of the clutch mechanism.

Thereupon, the spring 53 (Fig. drives the cam disk 52 ClOCliWlSS to turn the cam and cause it to rock the lever arms 48, -17 to press the spring contact 15 against contact blade 46 to complete the motor circuit (Fig. 6).

Substantially simultaneously therewith, the clutch members engage and the motor positively drives the train of gears leading from the drive gear 34 to the gears 92 and 94: to operate the machine, and wind up the clock spring 97.

At the beginning of its rotation, gear 92 withdraws the pin 106 from the arm 105 of the arresting bell crank 10%, whereupon spring 107 snaps the nose 108 of the bell crank into the path of the shoulder 101 on the cam disk 99. Gear 92 rotates gear 91 and the lip 102 in counter-clockwise direction (Fig. 1) and. in so doing, winds up the spring 97, which. because of its connection with the cam disk 99, turns the cam disk and its gear 100, as fast as the gear 9% and its lip 102 permit, since the spring 97, through the cam disk 99, presses the shoulder 101 against the lip 102.

The gear 91, cam 99 and gear 100 continue to rotate together until the shoulder 101 strikes and is arrested by the nose 108 of the arresting bell crank 10 1-. which ob structs the farther rotation at this time, of the cam disk 99 and gear 100. The positive drive from the gear 31, however, continues to turn the gear 91 and hence winds the spring 97 more tightly as the motor continues to turn, until near the end of the operation 01 the machine, the stud 60 (Figs. 1 and 7) on disk 61 when about completing a full rotation, contacts the end 02 of the detent lever 57 and rocks it into normal micetive position against the tension of its spring 59, the opposite end 01 the detent lever then lying in the path of the abutment 56 on one of the clutch members.

Immediately thereafter, the motor in roating the cl tch, brings the abutment 50 into contact with the end or" the detent lever which arrests farther rotation of the clutch member and ell ects the disconnection of the clutch in a manner well known in the art, the spring 53 (Fig. 5) being tensioned at that time, preparatory to advancing the clutch member 52 on the next operation.

The clutch member 52 is arrested at the time when its low point or recess is beneath he roller 51 of the make-and-break lever 48, 17, whereupon the resilience of spring contact 45 rocks the make-and-break lever 48,

17 to enter the roller 51 in the recess in clutch disk 52, which permits the spring contact arm 15 to withdraw from its co-acting contact 16 and interrupt the motor circuit at this point.

The motor armature, however, continues to rotate idly.

Substantially simultaneously with the arrest of the clutch member 52, the pin 106 on gear 92 in completing its rotation, trips the bell crank dog 10% and holds the dog in tripped position.

Removal of the dog from the path of the shoulder 101 trees the cam disk 99 and its gear 100 to the action of the wound spring 97 which immediately rotates the cam disk 99 and gear 100 counter-clockwise until the shoulder catches up with and arrested bv 'contact with the lug 102 which is held against advance at this time by the train oi and the detent lever 57 as well as by the load 01 the machine on the cam shaft 30.

The automatic switch 110 normally maintains the motor circuit closed at the contacts 117, 118, the roller 120 of the automatic lever 11G lying in the elongated depression in the cam disk 99, even when the cam disk advanced counter-clockwise from the position shown in Fig. 1 to the position wherein the shoulder 101 on the cam disk 99 con- 'tacts the detaining dog 101, but immediately at the beginning of the rotation of the cam disk 99 by the spring 97 after the dctaining dog 104:, releases the cam disk, an mnnutilated part of the cam disk 99 rides under the roller 120 to rock the automatic switch lever 116 and interrupt the motor circuit at the contacts 117, 118.

At this time, the motor circuit is interrupted at two dill'erent points, but may be closed at one of such points by depression of the starting key 82. However, such ac tion would not complete the circuit, which remains interrupted until the cam disk 99 as it reaches the end of its independent rotation, brings its low point 122 beneath the roller 120 on the automatic switch lever 110, whereupon the spring 121 snaps the contact 117 between the contact lips 118 to complete the motor circuit at this point.

And it is to extend the period during which the contacts 117, 118 remain separated that the lly 127 is geared to the cam disk 99.

lVhile the form of mechanism herein shown and described is admirably adapted to fulfill the objects primarily stated, it is to be understood that it is not intended to conline the invention to the one form or embodiment herein disclosed, for it is susceptible of embodiment in various forms all coming within the scope of the claims which follow.

' I 1. In a machine 0? 'maaoea a switch for closing a circuit the motor to enable said motor to operate the machine, of another switch in the same circuit and adapted to temporarily render said first mentioned switch ineflective for a predetermined length of time after the machine completes its operation.

2. In a machine of the class described, the combination with a driving motor, driving connections between the motor and the machine, a switch for closing a circuit through the motor to enable said motor to operate the machine, and means for simultaneously stopping. the machine and causing said switch to open, of another switch in said circuit, and means operated after the operation of the machine is completed to hold said second mentioned switch open to prevent a subsequent operation of the machine for a predetermined length of time.

3. In a machine of the class described, the combination with a driving motor, driving j connections between the motor and the machine, a switch for closing a circuit through the motor to enable said motor to operate the machine, and means for simultaneously stopping the machine and causing said switch to open, of another switch in said circuit, and a spring actuated means adapted to be released as the machine reaches its home position to open said second mentioned switch, and hold it open for a predetermined length of time.

4. In a machine of the class described, the combination with a driving motor, driving connections between the motor and the machine, a switch for closing a circuit through the motor to enable said motor to operate the machine, and means to simultaneously arrest the machine and enable said switch to open, of another switch in said circuit, a spring actuated cam to control the last-mentioned switch; means to arrest the cam, and means actuated as the machine reaches its home position to release said cam to open said switch and hold it open for a predetermined length of time. c

5. In a machine of the class described, the combination with a driving motor, driving connections between the motor and the machine, a switch for closing a circuit through the motor to enable said motor to operate t e machine, and means to simultaneously arrest the machine and enable said switch to open, of another switch in said circuit, a sprin actuated cam to control the last-mentlone switch, a spring for actuating said cam,

means to store power in said sprin during the operation of the machine, an means to enablesaid spring to operate the cam to,

open said switch and hold it open for a predetermined length of time.

'6. In a machine of the class described, the combination with a driving motor, driving connections between the motor and the machine, a switch for closing a circuit through the motor to enable said motorjtoi operate the machine, and means for simultaneously stopping the machine and enabling said switch'to open, of another switch "m said circuit, a spring actuated cam, to control the last-mentioned switch, a spring for actuating. said cam, a shoulder on said cam,

.a pawl cooperating with'said shouldenfor causing said sprin' to be wound and means adapted to isengagesaid paw from said shoulder, thereby releasing said spring topermit it to rotatesaid cam for opening said second mentioned switch and holding it open for a predeterimned length oftime. 7. In a machine'of the class describedfthe combination with a driving motor, a circuit for said motor, and .a switch for closing circuit, of another switch for preventing said first mentioned switch -from becoming effective for a certain length of time, a

and .mentioned switch, and a governor for controlling the action of said cam. I

8. In a machine ofthe class described capable of successive operations, the combia source of power; driving connections between the motor and the machine; a switch to close the circ'uitthrough the motor to enable the motor to operate the machineyand spring actuated cam for opening said sec-e90.

.nation with a driving motor in circuit with 185 means to enable the switch to open the ciriuo cuit at the end of each operation of the machine; of a' second normally closed switch in circuit with themotor; and means to open the second switch andto hold it open a sufficient length of time to permit the motor 11105 to come to res; after the circuit hasbee opened-at the first-named switch.

9; In a .machine of the class described capable of successive operations, the combinationwith a motor; a source ofpower in circuit with the motor drivin connections between the motor and the mac liine a manuallytripped'normally open switch in circuit with the motor; and means to automat ically. arrest the machine and. open themanually tripped switch at the end of an operation of .the machine; ofa normally closed switch in circuit with the motor; means to close the second-named switch; and means operable automatically to open the normally closed switch substantially simultaneously with'the automatic opening of the normally open switch. 10. In a machine ofthe class described, capable of successive operations, the con'ibi nation with a motor; driving connections between the motor and the machine; a normally 0 en, manually tripped switch in circuit wit the motor; andmeans to automatically arrest the machine, and open'the man- 'ually tripped switch at the end of an operation of the machine; of a normally closed switch in circuit with the motor; means to close the last-named switch; a power-storing means driven by the motor; means to trip the power-storing means for operation; and means operated by the power-storing means to open the last-named switch and hold it open temporarily, until the switchclosing means can operate.

11. The combination with a motor; a normally open, manually tripped switch in circuit with the motor; drive means operated by the motor; and means to automatically open the manually tripped switch; of a normally closed switch in circuit with the motor; means to close the last-named switch; a separate motor; means to free the separate motor for operation; and means operated by the last-named motor to automatically open the last-named switch, and to hold it open until the switch-closing means can operate.

12. The combination with a motor; 0. normally open, manually tripped switch in circuit with the motor; drive means operated by the motor; and means to automatically open the manually tripped switch; of a normally closed switch in circuit with the mo tor; means to close the last-named switch; a spring-motor wound by the first-named motor, a detent to enable the spring-motor to be wound; means operated by the firstnamed motor to trip the detent; and means operated by the spring motor to automatically open the last-named switch, and to hold it open until the switch-closing means can operate.

13. The combination with a motor; a normally open. manually tripped switch in circuit with the motor; drive means operated by the motor; and means to automatically open the manually tripped switch; of a normally closed switch in circuit with the motor; means to close the last-named switch; a cam disk to control the last-named switch; a spring to drive the cam disk when the motor circuit is opened at the first-named switch; a detent to prevent operation of the cam disk by the spring; means operated by the motor to trip the detent to enable the spring to rotate the cam to open the lastnamed switch, and to hold such switch open temporarily.

14:. The combination with a motor; a normally open, manually tripped switch in circuit with the motor; drive means operated by the motor; and means to automatically open the manually tripped switch; of a normally closed switch in circuit with the motor; means to close the last-named switch; a separate motor; means controlled by the first-named motor to free the last-named motor for operation; means operated by the last-named motor to open the last-named MAXIMILIAN M. GOLDBERG. 

